(C) The plant $Zamia$ $pygmaea$ is known for having a subterranean tuberous stem. It is considered one of the smallest gymnosperms. Unlike $Cycas$ or

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(C) The plant $Zamia$ $pygmaea$ is known for having a subterranean tuberous stem. It is considered one of the smallest gymnosperms. Unlike $Cycas$ or $Sequoia$, which have distinct aerial trunks, $Zamia$ has a stem that remains mostly underground, appearing tuberous or bulb-like.